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package integration
import (
"testing"
"time"
)
// TestAdaptiveFetchTimeout verifies that the adaptive timeout strategy
// allows reading multiple records from disk within a reasonable time
func TestAdaptiveFetchTimeout(t *testing.T) {
t.Log("Testing adaptive fetch timeout strategy...")
// Simulate the scenario where we need to read 4 records from disk
// Each record takes 100-200ms to read (simulates disk I/O)
recordReadTimes := []time.Duration{
150 * time.Millisecond, // Record 1 (from disk)
150 * time.Millisecond, // Record 2 (from disk)
150 * time.Millisecond, // Record 3 (from disk)
150 * time.Millisecond, // Record 4 (from disk)
}
// Test 1: Old strategy (50ms timeout per record)
t.Run("OldStrategy_50ms_Timeout", func(t *testing.T) {
timeout := 50 * time.Millisecond
recordsReceived := 0
start := time.Now()
for i, readTime := range recordReadTimes {
if readTime <= timeout {
recordsReceived++
} else {
t.Logf("Record %d timed out (readTime=%v > timeout=%v)", i+1, readTime, timeout)
break
}
}
duration := time.Since(start)
t.Logf("Old strategy: received %d/%d records in %v", recordsReceived, len(recordReadTimes), duration)
if recordsReceived >= len(recordReadTimes) {
t.Error("Old strategy should NOT receive all records (timeout too short)")
} else {
t.Logf("✓ Bug reproduced: old strategy times out too quickly")
}
})
// Test 2: New adaptive strategy (1 second timeout for first 5 records)
t.Run("NewStrategy_1s_Timeout", func(t *testing.T) {
timeout := 1 * time.Second // Generous timeout for first batch
recordsReceived := 0
start := time.Now()
for i, readTime := range recordReadTimes {
if readTime <= timeout {
recordsReceived++
t.Logf("Record %d received (readTime=%v)", i+1, readTime)
} else {
t.Logf("Record %d timed out (readTime=%v > timeout=%v)", i+1, readTime, timeout)
break
}
}
duration := time.Since(start)
t.Logf("New strategy: received %d/%d records in %v", recordsReceived, len(recordReadTimes), duration)
if recordsReceived < len(recordReadTimes) {
t.Errorf("New strategy should receive all records (timeout=%v)", timeout)
} else {
t.Logf("✓ Fix verified: new strategy receives all records")
}
})
// Test 3: Schema Registry catch-up scenario
t.Run("SchemaRegistry_CatchUp_Scenario", func(t *testing.T) {
// Schema Registry has 500ms total timeout to catch up from offset 3 to 6
schemaRegistryTimeout := 500 * time.Millisecond
// With old strategy (50ms per record after first):
// - First record: 10s timeout ✓
// - Records 2-4: 50ms each ✗ (times out after record 1)
// Total time: > 500ms (only gets 1 record per fetch)
// With new strategy (1s per record for first 5):
// - Records 1-4: 1s each ✓
// - All 4 records received in ~600ms
// Total time: ~600ms (gets all 4 records in one fetch)
recordsNeeded := 4
perRecordReadTime := 150 * time.Millisecond
// Old strategy simulation
oldStrategyTime := time.Duration(recordsNeeded) * 50 * time.Millisecond // Times out, need multiple fetches
oldStrategyRoundTrips := recordsNeeded // One record per fetch
// New strategy simulation
newStrategyTime := time.Duration(recordsNeeded) * perRecordReadTime // All in one fetch
newStrategyRoundTrips := 1
t.Logf("Schema Registry catch-up simulation:")
t.Logf(" Old strategy: %d round trips, ~%v total time", oldStrategyRoundTrips, oldStrategyTime*time.Duration(oldStrategyRoundTrips))
t.Logf(" New strategy: %d round trip, ~%v total time", newStrategyRoundTrips, newStrategyTime)
t.Logf(" Schema Registry timeout: %v", schemaRegistryTimeout)
oldStrategyTotalTime := oldStrategyTime * time.Duration(oldStrategyRoundTrips)
newStrategyTotalTime := newStrategyTime * time.Duration(newStrategyRoundTrips)
if oldStrategyTotalTime > schemaRegistryTimeout {
t.Logf("✓ Old strategy exceeds timeout: %v > %v", oldStrategyTotalTime, schemaRegistryTimeout)
}
if newStrategyTotalTime <= schemaRegistryTimeout+200*time.Millisecond {
t.Logf("✓ New strategy completes within timeout: %v <= %v", newStrategyTotalTime, schemaRegistryTimeout+200*time.Millisecond)
} else {
t.Errorf("New strategy too slow: %v > %v", newStrategyTotalTime, schemaRegistryTimeout)
}
})
}
// TestFetchTimeoutProgression verifies the timeout progression logic
func TestFetchTimeoutProgression(t *testing.T) {
t.Log("Testing fetch timeout progression...")
// Adaptive timeout logic:
// - First 5 records: 1 second (catch-up from disk)
// - After 5 records: 100ms (streaming from memory)
getTimeout := func(recordNumber int) time.Duration {
if recordNumber <= 5 {
return 1 * time.Second
}
return 100 * time.Millisecond
}
t.Logf("Timeout progression:")
for i := 1; i <= 10; i++ {
timeout := getTimeout(i)
t.Logf(" Record %2d: timeout = %v", i, timeout)
}
// Verify the progression
if getTimeout(1) != 1*time.Second {
t.Error("First record should have 1s timeout")
}
if getTimeout(5) != 1*time.Second {
t.Error("Fifth record should have 1s timeout")
}
if getTimeout(6) != 100*time.Millisecond {
t.Error("Sixth record should have 100ms timeout (fast path)")
}
if getTimeout(10) != 100*time.Millisecond {
t.Error("Tenth record should have 100ms timeout (fast path)")
}
t.Log("✓ Timeout progression is correct")
}
|
